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Old May 30, 2017, 4:12 PM   #1
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Default Inconisistent focusing with D800 in AF-C

I've had some focusing issues with the D800 and AF_C in the last couple of weeks with both the 50 and 85mm G's. This started a few weeks ago where I was at a friends daughters communion and found the cam struggling to take a shot or obtain focus. I ended up having to power off the cam and only this weekend noticed that some of the AF settings had reverted to defaults. Prior to that I used the cam with the 85mm at the London Marathon and the keeper rate was approx 75% (couldnt have been happier).

I've checked my AF settings (using back focus button; 1 or 9 point AF points; etc ) and reset them thinking I'd resolved the issue but only to find 50% of the pics I took on the weekend at ComicCon and Vitality 10K run are OFF. Any ideas what could be up ?
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Old Jun 9, 2017, 11:03 AM   #2
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Hi Hartj,

I did use the af-c mode now and then. This without problems. But settings where single point and 3D.
The 3D function works very well.
Maybe you can try this setting and see if there is a better result?

Greetings,
Pascal
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Old Jun 13, 2017, 4:13 AM   #3
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HI Psacal

Haven't tried the 3D AF - I gave it a quick go and then switched back to single/9 point when it was picking something else up. I didnt realise that only the centre group of AF points are cross types or any I wrong ?

I need to def work on my technique as I may have changed something and thats effecting the accuracy. Also need to look at calibrating the lenses and the D800.

Really wish Nikon had a full camera reset to defaults option like the Oly's. I'd like to reset the entire cam and reconfigure.


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Old Jun 20, 2017, 6:21 AM   #4
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Hi Harj,

In getting acquainted with your camera and playing with the various focus settings, you may have changed a setting or two in the CSM menu(custom setting menu). Ken Rockwell has a detailed explanation of the various AF focus modes and how they work. You may want to read it.

Please do post if you find the solution

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Old Jul 13, 2017, 8:53 PM   #5
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The D800 was know for this kind of focus issues, dis you fond the way to solve the problem?
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Old Aug 20, 2017, 10:31 AM   #6
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Guys


Sorry for not replying until now, Ive been busy taking quiet a few pics lately but none of them portraits or fashion!

Zig, thanks for the tip on KR, I'll need to take a look and go through it.

I'm still looking into this as its not resolved but think there was few things going on..:

1. The camera had somehow reset most of the AF settings that I had configured back to default. So when I thought I was in AF-C and using back button focus it wasn't. Not sure if this happened when the cam locked up and I had to power down and pull the battery out but I only noticed that the settings were all wrong when I watched a video that I used for helping me set up the AF on the D800. Now there is a battery recall from Nikon (my battery for the D800 needs to go back) so could it be power related ?

I've reset the settings back to what they I think they should have been and tracking is improved but its still inconsistent. I need to create a custom set of settings incase it happens again.

2. User error - I went back and looked through the Marathon pics and the hot rate was 50% but the 50% that were in focus were sharp and quite a few tack sharp. That isn't the case since the AF issue, some pics are tack sharp but they're in the minority. So that 75% hit rate that I came up was in a dream!

3. User experience - I've since been to a hockey tournement, a eco motoring race and 2 pro cycling road events and I'm still pretty inexperienced with being able to know what to do to get consistent results. I'm not confident that the AF is working the way it should, 3D tracking being a real case in point. At the last pro cycling event I stuck to 3D AF and you could see the AF point jump about and pic another part of the frame that you weren;t pointing at - ie instead of the cyclists face, it would jump behind and go for the rear spoke. The weather was pretty piss poor - poor light, it was fish weather and I was having to hold a brolley with the let hand and try and frame and shoot with the right without getting soaked.

4. The D800's AF is not as accurate as I thought it might be - but thats just me being silly. I need to get to know how it works.

I've not calibrated the lenses with the body yet ... thats next on the list.

Pics to follow in other posts



Harj

Last edited by HarjTT; Aug 20, 2017 at 10:38 AM.
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Old Aug 22, 2017, 9:25 PM   #7
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Harj,

The AF inconsistency of the Nikon D800 was a buzz after the release of this camera.

You should read this article by Tom Hogan about it:

http://www.dslrbodies.com/cameras/ca...s-problem.html
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Old Aug 24, 2017, 11:41 AM   #8
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First of all I have the 810, but I never have and never will use back focus.

Next why use anything other than a single focus point, especially indoors where lighting is poor ans well as contrast

EVERY single shot I take anywhere is AFC SINGLE focus point
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Old Aug 24, 2017, 6:18 PM   #9
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Marcelo



Thanks for the link to TH's blog on the AF issues.. I knew there were issues but only with a certain batch so I made sure to try and avoid those cams and the one I picked up didnt have a serial no in that range. I'll go through TH's post as I'm sure there's bound to be somthing in there to help.


JR1, thanks for the reply and trying to help. Its good to know what your setup is on your 810 is. I've never used anything other than single AF point and until I had the problem with the D800 that's all I was using. The vid I used to set the cam up stated single AF point was the way to go and thats how I had the cam setup when it started to play up. The 3D tracking was just me trying to see if it (1) actually worked or not and (2) helped to fix the problem which it didn't. The race was outdoors and weather conditions were pretty poor so I know those weren;t going to help.



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